“The essential elements to pleading a claim for conversion under California law are: 1. The plaintiff owned, possessed, or had a right to possess an item of personal property; 2. The defendant intentionally took possession of and/or prevented the plaintiff from having access to the property for a significant period of time after the plaintiff demanded its return; 3. The plaintiff did not consent to the defendant’s actions; 4. The plaintiff was harmed by the defendant’s actions; and 5. The defendant’s conduct was a substantial factor in causing the plaintiff’s harm.”
[California Elements of an Action [certain citations omitted]]